Our tech has plugged the MOH device into the moh port on the D1232 system, but now the MOH is playing on all of the phone intercoms. Is there a feature code to turn off the intercoms?

Try ressing your BGM button which would be S3, or try pressing [1], depending on what sets you are using.

dtmf, you are correct sir! you can also press "1" on any set to toggle it on and off.
The TD1232 also supports 2 inputs so if you wanted a different sorce for background music then what is used for music or message on hold you can do that.

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Don't get me started!

See I'm learning, had a good teacher.

Wow how much the U.S models differ to the AUS models. You have to press the hold button to switch bgm on and off on 1232s that i work on.